It's Totally Natural To Become More Boring As You Age"Happiness becomes less the high-energy, totally-psyched experience of a teenager partying while his parents are out of town, and more the peaceful, relaxing experience of an overworked mom who's been dreaming of that hot bath all day. ... It's a different way of understanding what happiness is" - as psychologists put it, promotion motivation versus prevention motivation.
The Atlantic 05/28/13